Rotary pivoted hammer



H. M. PLAISTED. ROTARY PIVOTED HAMMER.

APPLICATION FILED AUG.9, 1920.

1 ,4 l 3, 1- 1 Patentd Apr- 25, 1922.

HAROLD M. PLAISTEQOF' sh touts, finss'ofiai, AssIGNoR' orrbitrY-ivflvii ounnulvpaanrrrs To; WILLIA1YI$ EA-TENT onusrr'na & PULVERIZER comma, ST. LOUIS, issotmi, A eoaroaarrou or MISSOURI.

30mm nversnmmma:

To all whom it may concern-.-

Be it known that I, HAROLD M. PLAIS'TED, a citizen ofthe-United States, residing at St. Louis, State of -Missouri,have invented certain new and useful Improvementsi-n Rotary Pivoted Hammers, ofwhich the following is a' specification. This invention relates to certain new and useful improvements rotary hammers for feed: grindersor .lil're'l'nach-ine's, the 1 peculiar ities of whichwill be herein-after fully clescribed and claimed The main object: of my invention is to provide a rotary hammer of such-"shape that when mounted in an-row or rows a plurality ofs'uch' hammers will; form a double operative edge, or edges of different radii and" flexibly disposed paralled to the rotor-shaft; second,-to provide a hammer that when mounted in rows will furnish more cutting edges near the center orfmidway of the sides of the casingwh'ere the entering feed is normally of greater quan'-. tity, than at the sides; third, a hammer that tends to dislodge material c'ollected'hy an adjacent hammer; fourth; to provide a ha-mmerthat may be readily forged-to the'de sired shape; fifth, to provide a hammer that will cooperate with" deflecting means be tween the rotor shaft and the operative edges'whereby the material willvbe deflected into the path of the hammer. In the accompanying drawing in which like reference letters indicate corresponding parts, Fig. 1 represents a vertical sectional view through the axis" of the" rotor and portion' of the' hopper;- Fig. 2 a vertical sectional'elevation across the'rotor on the plane Q Q'ofFi'gL' 1; Fig; ea detached View of a cover plate having regulative openings for air inlet; and Fig; 4' a perspective" view of my preferred form of rotary hammer;

' In machines for grinding feed or other suitable material the tendency ofthe feed is toeeekthe middle of the hopper generally, and it'is' desirable to furnish mere cutting edges or operative edges at the-'eenter than at the sides-ef the easing also in hammers having rojecting heads or portions-the material is inclined to ledi e eirtheunderside" of said heads'; as-h'as been"- demonstrated by experience. In m preferred form of Hammer the heads are so "arranged that they overlapthe Heedsetadj acentlyloi 'ated ham? mers independently mounted in jrowsand flexibly disposed, whereby the reIativemeVe':

ment of adjacent hammers will dislodge Specification of Lttersratentl- Patefited A T Application filed Aug"1isti 9,1920l Seria1No. 402,202r

such collected, material. Likewise, I- have 1 provided r'neans'for throwing outward into the path of said overlapping heads, material that may crowd within the hammer circle v of the operative edges.

Referring to' the drawing; letter desi bearlngs between the sides B'B of a casmg having a hopper O, a breaker plate D,

anda grlndlng cage E adapt-ed toco'operat with rotary pivoted hammers pivotally mounted on rods F' or otherwise, carri d"- by discs Gr or other rod supports mouhted onthe shaft A These hammersin' the preferred ates a rotor shaft mounted in suitable formcomprise a shank having anopeni-ng or other means at one end for'pi'votal m'oii'ntijng and heads at th'e'opposite end of the slian'k'o'f peculiar construction as illustrated. In" the preferred' form of my'hanimer, a'"flat rel: atlvely thlnbar .of rectangular cross" section is fo'lded upon itself to form a" doubl'e'shank portion extending outward from the.

fold The line o f'fold lies "in the; plane of rotation. Near the fold is an opening J for the'ha nmer rod on which the hammer 1s pivoted. Thisopenin'g in the-flat sides of the double Stank 2111a its axis 'ieparauQ to the rotor shaft. *Thefree' en'd sof the Hat bar forming the hammer are benepttward "laterally in oppositedir'ections in the axial plane er the central line extending through the pivot opening and"form hea'ds K -=K{ that are stepped or located at different dista-n'ces'xfrom the" pivot end of the hammer,

and thus oscillate in circumferential plane's I lesser dimension of the bar" in lootli shank of unequalradii from the hammer pivot, and travel in hammer circles of unequalradii from the center-of the shaft; The" and head is presented to the materiar eper': I

at'e'd" on,t'o efi'e'ct a cutting action 'When a plurality of such hammers areflmeunted on a hammerjrod' as" shown Figure 1,- the heads of the sa'In'e'r-adius a'ijealined in each ew and normallyparallelj to the shaft, nd

overlap each otherand -for'in a; deubieeper 'ati e' edgei n each row intermediate of-tli e end hammers; where va singlelhead is presented to" thematerial" being ground; It

will be observed by refer nce to F1 i and ri :athatfiremanistoaafiwaw ga double thickness of the shank.

than the head K preferably, as the head K with its longer radial distance extends horizontally towards the single thickness of the adjacent longer shank while the head K is shorter on account of being opposite the In other words the projecting heads K-K extend unequal distances from the central plane of the shank through the meeting faces of the double portions H-H', when the same clearance is allowed between the endsof the heads K and Krespectively and the adj acent shanks.

The heads thus overlapping as shown in Fig. 1 andfl-exibly disposed on the hammer rods, will oscillate about their pivots when meeting unequal resistance from the feed material, and will tend to clear adj acent heads from collected material and will operate with especial efliciency on the feed ma terial.

When the material crowds upon the rotating hammers andpasses within the harm mer circles of the heads as above described, it is deflected outward again in my construction, by inclined blades L that are disposed, as shown in Fig. 2, between alternate pairs of discs GG between which the shanks of the hammers are mounted. These blades L may be integrally formed with one of the adjacent discs G, or otherwise, and preferably extend with a tangential inclination close to the hammer rods F, and leave a space between the inner end of each blade and the adjacent blade, as shown in Fig. 2, and also the hammer rod, through which space any material forced to the center may be discharged, and the blades will deflect such material outward again into the path or hammer circles of the heads K K. At

1 the end discs these blades will act as fans also which they are flexibly mounted on pivot rods eccentric to the rotor axis,thc heads of said hammers in each row being alternately located at longer and shorter distances from the pivot openings and on shanks correspondingly longer and shorter from their pivot openings,the shanks having their greater dimension disposed in parallel planes of rotation and the heads extending laterally from the shanks and having their greater dimension disposed in cylindrical planes of rotation of alternately longer and shorter radii,the lesser dimension of both heads and shanks forming cutting edges belng thus presented to the material being reing a double shank integrally connected at A its lower end by the fold and having an opening through the flat sides of each shank adapted for pivotal mounting near the fold,--the free ends of said bar being bent laterally in opposite directions in the axial plane of the central line extending through said opening.

3. A rotary pivoted hammer comprising a single piece of flat bar folded on itself intermediate of its ends forming a double shank integrally connected at the inner end by the fold and having an opening through the flat sides of the doubled shank adapted for pivotal mounting near the fold,the outer free endsof staid bar being bent laterally in opposite directions in the axial plane of the central line extendingthrough said opening, at different radial distances from the pivot. V

f. A rotary pivoted hammer comprising-a single piece of flat bar folded on itself intermediate of its ends forming a'double shank and having an opening near the fold for ivotal mounting,one free end'being bent out laterally at the outerend of the double shank and the other free end being formed on a single shank portion that isiextended beyond the double shank and is bent laterally in the opposite direction at a longer radial distance from the pivot opening.

5. A rotary pivoted'hammer comprising a' double shank folded fiat ways on itself through-out the length of. the shank and having an opening for pivotal mounting near the inner end, and having two heads projecting laterally and horizontally parallel to the pivot axis an unequal distance in each head from the meeting plane of the shanks and each head respectively located at unequal radial distances from the central line through the pivotal axis'at the folded endof the shank,-the line of said fold andthe plane of the meeting faces lying in the plane of rotation and at right angles to the pivot axis.

6. A plurality of rotary pivoted hammers mounted in a row, and each comprising a flat bar shank having a pivot hole near one end and laterally projecting heads located. at unequal distances from the pivot, the heads of the several shanks having the same radial distances being in line with each other and presenting the lesser dimension of the bar to thematerial operated on ,'a hammer rod passing through saidholes; and supports for said rods. 7

7. A plurality of rotary pivoted hammers adjacently mounted ina row and each comprising a shank having a pivot'holenear 0116 end and heads projecting-laterallyat different distances from the pivot, the heads having a longer radial distance overlapping the adjacent heads having a shorter. radial distance,-a hammer rod passing through said holes, and a rod support.

8. A plurality of rotary pivoted hammers mounted in rows and laterally adjacent in each ro\v,each hammer comprising a shank adapted for pivotal mounting and heads projecting laterally in opposite directions .at different distances from the pivot and overlapping adjacent heads and forming a flexible double operative edge intermediate of the ends of each row, substantially as described.

9. The combination with a plurality of rows of rotary pivoted hammers,each row comprising overlapping laterally projectin heads and radial shanks-having holes,o discs inpairs and having, holes, hammer rods passing through the holes in the shanks and discs, and a shaft for saiddiscs the said pairs of discs alternating axially and with inclined Webs forming deflecting blades located opposite said overlapping heads.

10. The combination With rotary pivoted hammers mounted in rows, and hammer rods for said hammers, of supports for said rods comprising alternately disposed discs in pairs and deflecting blades tangentially. arranged, substantially as described. v

In testimony whereof I have afliXed my signature;

HAROLD M. PLA ISTED. 

